Tube.



B. K. FORD.

was. APPLICATION FILED APR. III I918- 1,287,945. Patented Dec. 17, 1918.

WITNES8E8: INVENTOI? WM xcpwK ox' 9V.

I M jrromvns BEN K. FORD, OF E351 ORANGE, NEW JERSEY.

' roan.

Specification of Letters Patent.

Patented net. 17, ieis.

Application filed April 11, 1918. Serial No. 227,843.

I '0 all whom it may concern: Be it known that 1, BEN of the UnitedStates, and residing at East Orange, in the county of Essex and State ofNew Jersey, have invented a new and Improved Tube, of which thefollowing is a specification.

This invention relates to spirally wound tubes which may be formed onthe general type of machines shown in my Patent No. 1,059,045, datedApril ,15, 1913, and its object is to provide a tube formed by spirallywindin a band of paper or other fibrous materia in which the adjacentedges of the band are cemented together.

This invention consists in a tube made up of one or more layers, eachlayer being formed from a continuous band of fibrous material having itsadjacent edges cemented together. It also consists in such a layerformed from a continuous band having its adjacent edges beveled andoverlapping and cemented together.

In theaccompanying drawing, Figure 1 is a plan and Fig. 2 an endelevation of this improved tube. Fig. 3 is a longitudinal section of thewall of the preferred form of this tube and Fig. 4 is a similar sectionof a modifintion thereof.

Similar reference characters refer to like parts throughout the severalviews.

Spirally wound tubes are usually made of two layers, the joints between.themalternating, and with a minimum amount of glue between the twolayers. The joints are not filled with glue and there are, therefore,two continuous spiral lines of weakness in each such tube along whichthere is only a single thickness of material. 1

, In the present invention, edges of each of the bands of material forming the tube are cemented together, andbecause of the fact thatstrawboard, which is the usual material for forming tubes, is usuallystrongest at the point where two thicknesses are cemented together, thepresent tube is provided with two continuous spiral lines ofreinforcement. In addition'thereto, the tube itself is less imperviousto moisture as the usual passages arefilled.

In Fig. 3, both the outer and inner bands.

\ 1 and 2 are shown formed with beveled or skived edges, which, togetherwith the fiat K. Fonn, a citizen i will be distortedand of the justpreviously wound spiral which '9 and a true cylinder.

the adjacent contacting surfaces, in any desired manner before beingwound into a tube. In Fig. 4, the band 3 that forms one layer hasbeveled edges'while the band i'has edges at right angles to its faces.In both cases, the layer 5 of cement unites the two bands while theinclined layers 6 and radial layers 7 of the cement unite theedges ofthe bands. I may be beveled as in Fig. 6 before winding, I prefer toform these bands as shown in Fig. 5. Here the edges 9 and 10 of the band8 slope down in opposite directions, and in passingto the. windingmachine, the glue is applied to the surface 11 alone. When the band iswound, the portion 12'of this band laid onto the edge 9 will bring aline of the layer of cement which has been applied to the surface 11,between the portion 12 and the edge 9. This causes the portion 12 tofill the space between the edge Because of the inherent resilience ofthis tube material, a sufficient pressure will be maintained between theportion 12 and the edge 9 to insure a thorough uniting of the materials.N 0 change need be made in the devices shown in my prior patent forapplying the cement to the face 11 of the band.

The proportions of the materials and numbers of layers may e changed bythose skilled in this art without departing from the spirit of thisinvention.

I claim 1- 1. In a tube, the combination of a continuous spirally woundband of fibrous material and cement filling the space between anduniting adja"ent edges of said band, said edges being beveled.

2. In a tube, the combination of a continuous spirally wound band offibrous material and cement filling the space between and uniting adjaent edges of said hand,

both of the edges of said band normally sloping outwardly of the tubetoward each other but one of said edges being distorted to lie upon theother beveled edge of the next spiral to fill thespace between said edgeand a true cylinder.

BEN K. FORD.

are coated with cement While the bands 1, 2 and 3 Wlll cause thisportion 12 to be bent up, as shown in dotted lines in Fig. 5, and

